Full-fiber Fourier transform spectrometer based on PZT phase modulation real-time compensation

Abstract

The invention belongs to the field of spectrum instruments, and provides a novel Full-fiber Fourier transform spectrometer, which improves the precision and the reliability of the FFTS instrument, eliminates noise and artifacts, and has the characteristics of miniaturization, portability and the like. The technical solution adopted by the invention is a full-fiber Fourier transform spectrometer based on the PZT phase modulation real-time compensation, and the structure is as follows : the sensing arms of the two optical fiber interferometers are wound on the same optical fiber phase modulatorPZT, so that the two optical fiber interferometers are fully synchronized and consistent; the test light enters one input end of the broadband coupler WIC1 through a coupling lens, and is divided intotwo bundles of 50:50 through the coupler WIC1, one bundle of fibers wound by the piezoelectric ceramic phase modulator in parallel, and the other bundle passing through the arm length matching fiber., respectively, enters the input end of the wideband coupler WIC2, and forms interference fringes at its output end after passing through the wideband coupler WIC2. The full-fiber Fourier transform spectrometer based on PZT phase modulation real-time compensation is mainly applied to the field of spectrum detection.

Description

technical field [0001] The invention belongs to the field of spectroscopic instruments, in particular to the design of an all-fiber Fourier transform spectrometer. Specifically, it involves an all-fiber Fourier transform spectrometer based on PZT phase modulation real-time compensation. Background technique [0002] Fourier transform spectrometers (FTS) are widely used to measure weak spectral signals and broadband spectra. FTS is an interferometric spectrometer that uses the Fourier transform pair between the interferogram and the spectrogram to achieve spectrogram analysis by measuring the interferogram. It has many advantages such as multi-channel, high throughput, high resolution and high wavenumber accuracy. FTS was originally used in the field of chemical analysis. With the maturity of the theoretical system, its application in the fields of astronomy and gas composition detection has also received extensive attention, and has broad development and application prosp...

AI Technical Summary

Problems solved by technology

However, the nonlinearity of PZT will lead to inaccurate sampling position; the sampling trigger signal generated by the reference optical path is inconsistent with the test optical path, which will cause phase error; especially, the turning point of PZT displacement will cause phase mutation; currently, PZT nonlinear and sampling delay become critical issues

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